Pileus Git - ~andy/linux/blob - drivers/acpi/sleep.c

   1 /*
   2  * sleep.c - ACPI sleep support.
   3  *
   4  * Copyright (c) 2005 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
   5  * Copyright (c) 2004 David Shaohua Li <shaohua.li@intel.com>
   6  * Copyright (c) 2000-2003 Patrick Mochel
   7  * Copyright (c) 2003 Open Source Development Lab
   8  *
   9  * This file is released under the GPLv2.
  10  *
  11  */
  12
  13 #include <linux/delay.h>
  14 #include <linux/irq.h>
  15 #include <linux/dmi.h>
  16 #include <linux/device.h>
  17 #include <linux/suspend.h>
  18 #include <linux/reboot.h>
  19 #include <linux/acpi.h>
  20
  21 #include <asm/io.h>
  22
  23 #include <acpi/acpi_bus.h>
  24 #include <acpi/acpi_drivers.h>
  25
  26 #include "internal.h"
  27 #include "sleep.h"
  28
  29 static u8 sleep_states[ACPI_S_STATE_COUNT];
  30
  31 static void acpi_sleep_tts_switch(u32 acpi_state)
  32 {
  33         union acpi_object in_arg = { ACPI_TYPE_INTEGER };
  34         struct acpi_object_list arg_list = { 1, &in_arg };
  35         acpi_status status = AE_OK;
  36
  37         in_arg.integer.value = acpi_state;
  38         status = acpi_evaluate_object(NULL, "\\_TTS", &arg_list, NULL);
  39         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
  40                 /*
  41                  * OS can't evaluate the _TTS object correctly. Some warning
  42                  * message will be printed. But it won't break anything.
  43                  */
  44                 printk(KERN_NOTICE "Failure in evaluating _TTS object\n");
  45         }
  46 }
  47
  48 static int tts_notify_reboot(struct notifier_block *this,
  49                         unsigned long code, void *x)
  50 {
  51         acpi_sleep_tts_switch(ACPI_STATE_S5);
  52         return NOTIFY_DONE;
  53 }
  54
  55 static struct notifier_block tts_notifier = {
  56         .notifier_call  = tts_notify_reboot,
  57         .next           = NULL,
  58         .priority       = 0,
  59 };
  60
  61 static int acpi_sleep_prepare(u32 acpi_state)
  62 {
  63 #ifdef CONFIG_ACPI_SLEEP
  64         /* do we have a wakeup address for S2 and S3? */
  65         if (acpi_state == ACPI_STATE_S3) {
  66                 if (!acpi_wakeup_address) {
  67                         return -EFAULT;
  68                 }
  69                 acpi_set_firmware_waking_vector(
  70                                 (acpi_physical_address)acpi_wakeup_address);
  71
  72         }
  73         ACPI_FLUSH_CPU_CACHE();
  74 #endif
  75         printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n",
  76                 acpi_state);
  77         acpi_enable_wakeup_devices(acpi_state);
  78         acpi_enter_sleep_state_prep(acpi_state);
  79         return 0;
  80 }
  81
  82 #ifdef CONFIG_ACPI_SLEEP
  83 static u32 acpi_target_sleep_state = ACPI_STATE_S0;
  84
  85 /*
  86  * The ACPI specification wants us to save NVS memory regions during hibernation
  87  * and to restore them during the subsequent resume.  Windows does that also for
  88  * suspend to RAM.  However, it is known that this mechanism does not work on
  89  * all machines, so we allow the user to disable it with the help of the
  90  * 'acpi_sleep=nonvs' kernel command line option.
  91  */
  92 static bool nvs_nosave;
  93
  94 void __init acpi_nvs_nosave(void)
  95 {
  96         nvs_nosave = true;
  97 }
  98
  99 /*
 100  * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the
 101  * user to request that behavior by using the 'acpi_old_suspend_ordering'
 102  * kernel command line option that causes the following variable to be set.
 103  */
 104 static bool old_suspend_ordering;
 105
 106 void __init acpi_old_suspend_ordering(void)
 107 {
 108         old_suspend_ordering = true;
 109 }
 110
 111 /**
 112  * acpi_pm_freeze - Disable the GPEs and suspend EC transactions.
 113  */
 114 static int acpi_pm_freeze(void)
 115 {
 116         acpi_disable_all_gpes();
 117         acpi_os_wait_events_complete(NULL);
 118         acpi_ec_block_transactions();
 119         return 0;
 120 }
 121
 122 /**
 123  * acpi_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS.
 124  */
 125 static int acpi_pm_pre_suspend(void)
 126 {
 127         acpi_pm_freeze();
 128         return suspend_nvs_save();
 129 }
 130
 131 /**
 132  *      __acpi_pm_prepare - Prepare the platform to enter the target state.
 133  *
 134  *      If necessary, set the firmware waking vector and do arch-specific
 135  *      nastiness to get the wakeup code to the waking vector.
 136  */
 137 static int __acpi_pm_prepare(void)
 138 {
 139         int error = acpi_sleep_prepare(acpi_target_sleep_state);
 140         if (error)
 141                 acpi_target_sleep_state = ACPI_STATE_S0;
 142
 143         return error;
 144 }
 145
 146 /**
 147  *      acpi_pm_prepare - Prepare the platform to enter the target sleep
 148  *              state and disable the GPEs.
 149  */
 150 static int acpi_pm_prepare(void)
 151 {
 152         int error = __acpi_pm_prepare();
 153         if (!error)
 154                 error = acpi_pm_pre_suspend();
 155
 156         return error;
 157 }
 158
 159 /**
 160  *      acpi_pm_finish - Instruct the platform to leave a sleep state.
 161  *
 162  *      This is called after we wake back up (or if entering the sleep state
 163  *      failed).
 164  */
 165 static void acpi_pm_finish(void)
 166 {
 167         u32 acpi_state = acpi_target_sleep_state;
 168
 169         acpi_ec_unblock_transactions();
 170         suspend_nvs_free();
 171
 172         if (acpi_state == ACPI_STATE_S0)
 173                 return;
 174
 175         printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n",
 176                 acpi_state);
 177         acpi_disable_wakeup_devices(acpi_state);
 178         acpi_leave_sleep_state(acpi_state);
 179
 180         /* reset firmware waking vector */
 181         acpi_set_firmware_waking_vector((acpi_physical_address) 0);
 182
 183         acpi_target_sleep_state = ACPI_STATE_S0;
 184 }
 185
 186 /**
 187  *      acpi_pm_end - Finish up suspend sequence.
 188  */
 189 static void acpi_pm_end(void)
 190 {
 191         /*
 192          * This is necessary in case acpi_pm_finish() is not called during a
 193          * failing transition to a sleep state.
 194          */
 195         acpi_target_sleep_state = ACPI_STATE_S0;
 196         acpi_sleep_tts_switch(acpi_target_sleep_state);
 197 }
 198 #else /* !CONFIG_ACPI_SLEEP */
 199 #define acpi_target_sleep_state ACPI_STATE_S0
 200 #endif /* CONFIG_ACPI_SLEEP */
 201
 202 #ifdef CONFIG_SUSPEND
 203 static u32 acpi_suspend_states[] = {
 204         [PM_SUSPEND_ON] = ACPI_STATE_S0,
 205         [PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
 206         [PM_SUSPEND_MEM] = ACPI_STATE_S3,
 207         [PM_SUSPEND_MAX] = ACPI_STATE_S5
 208 };
 209
 210 /**
 211  *      acpi_suspend_begin - Set the target system sleep state to the state
 212  *              associated with given @pm_state, if supported.
 213  */
 214 static int acpi_suspend_begin(suspend_state_t pm_state)
 215 {
 216         u32 acpi_state = acpi_suspend_states[pm_state];
 217         int error = 0;
 218
 219         error = nvs_nosave ? 0 : suspend_nvs_alloc();
 220         if (error)
 221                 return error;
 222
 223         if (sleep_states[acpi_state]) {
 224                 acpi_target_sleep_state = acpi_state;
 225                 acpi_sleep_tts_switch(acpi_target_sleep_state);
 226         } else {
 227                 printk(KERN_ERR "ACPI does not support this state: %d\n",
 228                         pm_state);
 229                 error = -ENOSYS;
 230         }
 231         return error;
 232 }
 233
 234 /**
 235  *      acpi_suspend_enter - Actually enter a sleep state.
 236  *      @pm_state: ignored
 237  *
 238  *      Flush caches and go to sleep. For STR we have to call arch-specific
 239  *      assembly, which in turn call acpi_enter_sleep_state().
 240  *      It's unfortunate, but it works. Please fix if you're feeling frisky.
 241  */
 242 static int acpi_suspend_enter(suspend_state_t pm_state)
 243 {
 244         acpi_status status = AE_OK;
 245         u32 acpi_state = acpi_target_sleep_state;
 246         int error;
 247
 248         ACPI_FLUSH_CPU_CACHE();
 249
 250         switch (acpi_state) {
 251         case ACPI_STATE_S1:
 252                 barrier();
 253                 status = acpi_enter_sleep_state(acpi_state,
 254                                 ACPI_NO_OPTIONAL_METHODS);
 255                 break;
 256
 257         case ACPI_STATE_S3:
 258                 error = acpi_suspend_lowlevel();
 259                 if (error)
 260                         return error;
 261                 pr_info(PREFIX "Low-level resume complete\n");
 262                 break;
 263         }
 264
 265         /* This violates the spec but is required for bug compatibility. */
 266         acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);
 267
 268         /* Reprogram control registers and execute _BFS */
 269         acpi_leave_sleep_state_prep(acpi_state, ACPI_NO_OPTIONAL_METHODS);
 270
 271         /* ACPI 3.0 specs (P62) says that it's the responsibility
 272          * of the OSPM to clear the status bit [ implying that the
 273          * POWER_BUTTON event should not reach userspace ]
 274          */
 275         if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3))
 276                 acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
 277
 278         /*
 279          * Disable and clear GPE status before interrupt is enabled. Some GPEs
 280          * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
 281          * acpi_leave_sleep_state will reenable specific GPEs later
 282          */
 283         acpi_disable_all_gpes();
 284         /* Allow EC transactions to happen. */
 285         acpi_ec_unblock_transactions_early();
 286
 287         suspend_nvs_restore();
 288
 289         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
 290 }
 291
 292 static int acpi_suspend_state_valid(suspend_state_t pm_state)
 293 {
 294         u32 acpi_state;
 295
 296         switch (pm_state) {
 297         case PM_SUSPEND_ON:
 298         case PM_SUSPEND_STANDBY:
 299         case PM_SUSPEND_MEM:
 300                 acpi_state = acpi_suspend_states[pm_state];
 301
 302                 return sleep_states[acpi_state];
 303         default:
 304                 return 0;
 305         }
 306 }
 307
 308 static const struct platform_suspend_ops acpi_suspend_ops = {
 309         .valid = acpi_suspend_state_valid,
 310         .begin = acpi_suspend_begin,
 311         .prepare_late = acpi_pm_prepare,
 312         .enter = acpi_suspend_enter,
 313         .wake = acpi_pm_finish,
 314         .end = acpi_pm_end,
 315 };
 316
 317 /**
 318  *      acpi_suspend_begin_old - Set the target system sleep state to the
 319  *              state associated with given @pm_state, if supported, and
 320  *              execute the _PTS control method.  This function is used if the
 321  *              pre-ACPI 2.0 suspend ordering has been requested.
 322  */
 323 static int acpi_suspend_begin_old(suspend_state_t pm_state)
 324 {
 325         int error = acpi_suspend_begin(pm_state);
 326         if (!error)
 327                 error = __acpi_pm_prepare();
 328
 329         return error;
 330 }
 331
 332 /*
 333  * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
 334  * been requested.
 335  */
 336 static const struct platform_suspend_ops acpi_suspend_ops_old = {
 337         .valid = acpi_suspend_state_valid,
 338         .begin = acpi_suspend_begin_old,
 339         .prepare_late = acpi_pm_pre_suspend,
 340         .enter = acpi_suspend_enter,
 341         .wake = acpi_pm_finish,
 342         .end = acpi_pm_end,
 343         .recover = acpi_pm_finish,
 344 };
 345
 346 static int __init init_old_suspend_ordering(const struct dmi_system_id *d)
 347 {
 348         old_suspend_ordering = true;
 349         return 0;
 350 }
 351
 352 static int __init init_nvs_nosave(const struct dmi_system_id *d)
 353 {
 354         acpi_nvs_nosave();
 355         return 0;
 356 }
 357
 358 static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
 359         {
 360         .callback = init_old_suspend_ordering,
 361         .ident = "Abit KN9 (nForce4 variant)",
 362         .matches = {
 363                 DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"),
 364                 DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"),
 365                 },
 366         },
 367         {
 368         .callback = init_old_suspend_ordering,
 369         .ident = "HP xw4600 Workstation",
 370         .matches = {
 371                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 372                 DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"),
 373                 },
 374         },
 375         {
 376         .callback = init_old_suspend_ordering,
 377         .ident = "Asus Pundit P1-AH2 (M2N8L motherboard)",
 378         .matches = {
 379                 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."),
 380                 DMI_MATCH(DMI_BOARD_NAME, "M2N8L"),
 381                 },
 382         },
 383         {
 384         .callback = init_old_suspend_ordering,
 385         .ident = "Panasonic CF51-2L",
 386         .matches = {
 387                 DMI_MATCH(DMI_BOARD_VENDOR,
 388                                 "Matsushita Electric Industrial Co.,Ltd."),
 389                 DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"),
 390                 },
 391         },
 392         {
 393         .callback = init_nvs_nosave,
 394         .ident = "Sony Vaio VGN-FW21E",
 395         .matches = {
 396                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 397                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21E"),
 398                 },
 399         },
 400         {
 401         .callback = init_nvs_nosave,
 402         .ident = "Sony Vaio VPCEB17FX",
 403         .matches = {
 404                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 405                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB17FX"),
 406                 },
 407         },
 408         {
 409         .callback = init_nvs_nosave,
 410         .ident = "Sony Vaio VGN-SR11M",
 411         .matches = {
 412                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 413                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR11M"),
 414                 },
 415         },
 416         {
 417         .callback = init_nvs_nosave,
 418         .ident = "Everex StepNote Series",
 419         .matches = {
 420                 DMI_MATCH(DMI_SYS_VENDOR, "Everex Systems, Inc."),
 421                 DMI_MATCH(DMI_PRODUCT_NAME, "Everex StepNote Series"),
 422                 },
 423         },
 424         {
 425         .callback = init_nvs_nosave,
 426         .ident = "Sony Vaio VPCEB1Z1E",
 427         .matches = {
 428                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 429                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1Z1E"),
 430                 },
 431         },
 432         {
 433         .callback = init_nvs_nosave,
 434         .ident = "Sony Vaio VGN-NW130D",
 435         .matches = {
 436                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 437                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NW130D"),
 438                 },
 439         },
 440         {
 441         .callback = init_nvs_nosave,
 442         .ident = "Sony Vaio VPCCW29FX",
 443         .matches = {
 444                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 445                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCCW29FX"),
 446                 },
 447         },
 448         {
 449         .callback = init_nvs_nosave,
 450         .ident = "Averatec AV1020-ED2",
 451         .matches = {
 452                 DMI_MATCH(DMI_SYS_VENDOR, "AVERATEC"),
 453                 DMI_MATCH(DMI_PRODUCT_NAME, "1000 Series"),
 454                 },
 455         },
 456         {
 457         .callback = init_old_suspend_ordering,
 458         .ident = "Asus A8N-SLI DELUXE",
 459         .matches = {
 460                 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
 461                 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI DELUXE"),
 462                 },
 463         },
 464         {
 465         .callback = init_old_suspend_ordering,
 466         .ident = "Asus A8N-SLI Premium",
 467         .matches = {
 468                 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
 469                 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI Premium"),
 470                 },
 471         },
 472         {
 473         .callback = init_nvs_nosave,
 474         .ident = "Sony Vaio VGN-SR26GN_P",
 475         .matches = {
 476                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 477                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR26GN_P"),
 478                 },
 479         },
 480         {
 481         .callback = init_nvs_nosave,
 482         .ident = "Sony Vaio VGN-FW520F",
 483         .matches = {
 484                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 485                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW520F"),
 486                 },
 487         },
 488         {
 489         .callback = init_nvs_nosave,
 490         .ident = "Asus K54C",
 491         .matches = {
 492                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
 493                 DMI_MATCH(DMI_PRODUCT_NAME, "K54C"),
 494                 },
 495         },
 496         {
 497         .callback = init_nvs_nosave,
 498         .ident = "Asus K54HR",
 499         .matches = {
 500                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
 501                 DMI_MATCH(DMI_PRODUCT_NAME, "K54HR"),
 502                 },
 503         },
 504         {},
 505 };
 506 #endif /* CONFIG_SUSPEND */
 507
 508 #ifdef CONFIG_HIBERNATION
 509 static unsigned long s4_hardware_signature;
 510 static struct acpi_table_facs *facs;
 511 static bool nosigcheck;
 512
 513 void __init acpi_no_s4_hw_signature(void)
 514 {
 515         nosigcheck = true;
 516 }
 517
 518 static int acpi_hibernation_begin(void)
 519 {
 520         int error;
 521
 522         error = nvs_nosave ? 0 : suspend_nvs_alloc();
 523         if (!error) {
 524                 acpi_target_sleep_state = ACPI_STATE_S4;
 525                 acpi_sleep_tts_switch(acpi_target_sleep_state);
 526         }
 527
 528         return error;
 529 }
 530
 531 static int acpi_hibernation_enter(void)
 532 {
 533         acpi_status status = AE_OK;
 534
 535         ACPI_FLUSH_CPU_CACHE();
 536
 537         /* This shouldn't return.  If it returns, we have a problem */
 538         status = acpi_enter_sleep_state(ACPI_STATE_S4, ACPI_NO_OPTIONAL_METHODS);
 539         /* Reprogram control registers and execute _BFS */
 540         acpi_leave_sleep_state_prep(ACPI_STATE_S4, ACPI_NO_OPTIONAL_METHODS);
 541
 542         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
 543 }
 544
 545 static void acpi_hibernation_leave(void)
 546 {
 547         /*
 548          * If ACPI is not enabled by the BIOS and the boot kernel, we need to
 549          * enable it here.
 550          */
 551         acpi_enable();
 552         /* Reprogram control registers and execute _BFS */
 553         acpi_leave_sleep_state_prep(ACPI_STATE_S4, ACPI_NO_OPTIONAL_METHODS);
 554         /* Check the hardware signature */
 555         if (facs && s4_hardware_signature != facs->hardware_signature) {
 556                 printk(KERN_EMERG "ACPI: Hardware changed while hibernated, "
 557                         "cannot resume!\n");
 558                 panic("ACPI S4 hardware signature mismatch");
 559         }
 560         /* Restore the NVS memory area */
 561         suspend_nvs_restore();
 562         /* Allow EC transactions to happen. */
 563         acpi_ec_unblock_transactions_early();
 564 }
 565
 566 static void acpi_pm_thaw(void)
 567 {
 568         acpi_ec_unblock_transactions();
 569         acpi_enable_all_runtime_gpes();
 570 }
 571
 572 static const struct platform_hibernation_ops acpi_hibernation_ops = {
 573         .begin = acpi_hibernation_begin,
 574         .end = acpi_pm_end,
 575         .pre_snapshot = acpi_pm_prepare,
 576         .finish = acpi_pm_finish,
 577         .prepare = acpi_pm_prepare,
 578         .enter = acpi_hibernation_enter,
 579         .leave = acpi_hibernation_leave,
 580         .pre_restore = acpi_pm_freeze,
 581         .restore_cleanup = acpi_pm_thaw,
 582 };
 583
 584 /**
 585  *      acpi_hibernation_begin_old - Set the target system sleep state to
 586  *              ACPI_STATE_S4 and execute the _PTS control method.  This
 587  *              function is used if the pre-ACPI 2.0 suspend ordering has been
 588  *              requested.
 589  */
 590 static int acpi_hibernation_begin_old(void)
 591 {
 592         int error;
 593         /*
 594          * The _TTS object should always be evaluated before the _PTS object.
 595          * When the old_suspended_ordering is true, the _PTS object is
 596          * evaluated in the acpi_sleep_prepare.
 597          */
 598         acpi_sleep_tts_switch(ACPI_STATE_S4);
 599
 600         error = acpi_sleep_prepare(ACPI_STATE_S4);
 601
 602         if (!error) {
 603                 if (!nvs_nosave)
 604                         error = suspend_nvs_alloc();
 605                 if (!error)
 606                         acpi_target_sleep_state = ACPI_STATE_S4;
 607         }
 608         return error;
 609 }
 610
 611 /*
 612  * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
 613  * been requested.
 614  */
 615 static const struct platform_hibernation_ops acpi_hibernation_ops_old = {
 616         .begin = acpi_hibernation_begin_old,
 617         .end = acpi_pm_end,
 618         .pre_snapshot = acpi_pm_pre_suspend,
 619         .prepare = acpi_pm_freeze,
 620         .finish = acpi_pm_finish,
 621         .enter = acpi_hibernation_enter,
 622         .leave = acpi_hibernation_leave,
 623         .pre_restore = acpi_pm_freeze,
 624         .restore_cleanup = acpi_pm_thaw,
 625         .recover = acpi_pm_finish,
 626 };
 627 #endif /* CONFIG_HIBERNATION */
 628
 629 int acpi_suspend(u32 acpi_state)
 630 {
 631         suspend_state_t states[] = {
 632                 [1] = PM_SUSPEND_STANDBY,
 633                 [3] = PM_SUSPEND_MEM,
 634                 [5] = PM_SUSPEND_MAX
 635         };
 636
 637         if (acpi_state < 6 && states[acpi_state])
 638                 return pm_suspend(states[acpi_state]);
 639         if (acpi_state == 4)
 640                 return hibernate();
 641         return -EINVAL;
 642 }
 643
 644 #ifdef CONFIG_PM
 645 /**
 646  *      acpi_pm_device_sleep_state - return preferred power state of ACPI device
 647  *              in the system sleep state given by %acpi_target_sleep_state
 648  *      @dev: device to examine; its driver model wakeup flags control
 649  *              whether it should be able to wake up the system
 650  *      @d_min_p: used to store the upper limit of allowed states range
 651  *      Return value: preferred power state of the device on success, -ENODEV on
 652  *              failure (ie. if there's no 'struct acpi_device' for @dev)
 653  *
 654  *      Find the lowest power (highest number) ACPI device power state that
 655  *      device @dev can be in while the system is in the sleep state represented
 656  *      by %acpi_target_sleep_state.  If @wake is nonzero, the device should be
 657  *      able to wake up the system from this sleep state.  If @d_min_p is set,
 658  *      the highest power (lowest number) device power state of @dev allowed
 659  *      in this system sleep state is stored at the location pointed to by it.
 660  *
 661  *      The caller must ensure that @dev is valid before using this function.
 662  *      The caller is also responsible for figuring out if the device is
 663  *      supposed to be able to wake up the system and passing this information
 664  *      via @wake.
 665  */
 666
 667 int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p)
 668 {
 669         acpi_handle handle = DEVICE_ACPI_HANDLE(dev);
 670         struct acpi_device *adev;
 671         char acpi_method[] = "_SxD";
 672         unsigned long long d_min, d_max;
 673
 674         if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
 675                 printk(KERN_DEBUG "ACPI handle has no context!\n");
 676                 return -ENODEV;
 677         }
 678
 679         acpi_method[2] = '0' + acpi_target_sleep_state;
 680         /*
 681          * If the sleep state is S0, we will return D3, but if the device has
 682          * _S0W, we will use the value from _S0W
 683          */
 684         d_min = ACPI_STATE_D0;
 685         d_max = ACPI_STATE_D3;
 686
 687         /*
 688          * If present, _SxD methods return the minimum D-state (highest power
 689          * state) we can use for the corresponding S-states.  Otherwise, the
 690          * minimum D-state is D0 (ACPI 3.x).
 691          *
 692          * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer
 693          * provided -- that's our fault recovery, we ignore retval.
 694          */
 695         if (acpi_target_sleep_state > ACPI_STATE_S0)
 696                 acpi_evaluate_integer(handle, acpi_method, NULL, &d_min);
 697
 698         /*
 699          * If _PRW says we can wake up the system from the target sleep state,
 700          * the D-state returned by _SxD is sufficient for that (we assume a
 701          * wakeup-aware driver if wake is set).  Still, if _SxW exists
 702          * (ACPI 3.x), it should return the maximum (lowest power) D-state that
 703          * can wake the system.  _S0W may be valid, too.
 704          */
 705         if (acpi_target_sleep_state == ACPI_STATE_S0 ||
 706             (device_may_wakeup(dev) &&
 707              adev->wakeup.sleep_state <= acpi_target_sleep_state)) {
 708                 acpi_status status;
 709
 710                 acpi_method[3] = 'W';
 711                 status = acpi_evaluate_integer(handle, acpi_method, NULL,
 712                                                 &d_max);
 713                 if (ACPI_FAILURE(status)) {
 714                         if (acpi_target_sleep_state != ACPI_STATE_S0 ||
 715                             status != AE_NOT_FOUND)
 716                                 d_max = d_min;
 717                 } else if (d_max < d_min) {
 718                         /* Warn the user of the broken DSDT */
 719                         printk(KERN_WARNING "ACPI: Wrong value from %s\n",
 720                                 acpi_method);
 721                         /* Sanitize it */
 722                         d_min = d_max;
 723                 }
 724         }
 725
 726         if (d_min_p)
 727                 *d_min_p = d_min;
 728         return d_max;
 729 }
 730 #endif /* CONFIG_PM */
 731
 732 #ifdef CONFIG_PM_SLEEP
 733 /**
 734  *      acpi_pm_device_sleep_wake - enable or disable the system wake-up
 735  *                                  capability of given device
 736  *      @dev: device to handle
 737  *      @enable: 'true' - enable, 'false' - disable the wake-up capability
 738  */
 739 int acpi_pm_device_sleep_wake(struct device *dev, bool enable)
 740 {
 741         acpi_handle handle;
 742         struct acpi_device *adev;
 743         int error;
 744
 745         if (!device_can_wakeup(dev))
 746                 return -EINVAL;
 747
 748         handle = DEVICE_ACPI_HANDLE(dev);
 749         if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
 750                 dev_dbg(dev, "ACPI handle has no context in %s!\n", __func__);
 751                 return -ENODEV;
 752         }
 753
 754         error = enable ?
 755                 acpi_enable_wakeup_device_power(adev, acpi_target_sleep_state) :
 756                 acpi_disable_wakeup_device_power(adev);
 757         if (!error)
 758                 dev_info(dev, "wake-up capability %s by ACPI\n",
 759                                 enable ? "enabled" : "disabled");
 760
 761         return error;
 762 }
 763 #endif  /* CONFIG_PM_SLEEP */
 764
 765 static void acpi_power_off_prepare(void)
 766 {
 767         /* Prepare to power off the system */
 768         acpi_sleep_prepare(ACPI_STATE_S5);
 769         acpi_disable_all_gpes();
 770 }
 771
 772 static void acpi_power_off(void)
 773 {
 774         /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
 775         printk(KERN_DEBUG "%s called\n", __func__);
 776         local_irq_disable();
 777         acpi_enter_sleep_state(ACPI_STATE_S5, ACPI_NO_OPTIONAL_METHODS);
 778 }
 779
 780 /*
 781  * ACPI 2.0 created the optional _GTS and _BFS,
 782  * but industry adoption has been neither rapid nor broad.
 783  *
 784  * Linux gets into trouble when it executes poorly validated
 785  * paths through the BIOS, so disable _GTS and _BFS by default,
 786  * but do speak up and offer the option to enable them.
 787  */
 788 static void __init acpi_gts_bfs_check(void)
 789 {
 790         acpi_handle dummy;
 791
 792         if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_PATHNAME__GTS, &dummy)))
 793         {
 794                 printk(KERN_NOTICE PREFIX "BIOS offers _GTS\n");
 795                 printk(KERN_NOTICE PREFIX "If \"acpi.gts=1\" improves suspend, "
 796                         "please notify linux-acpi@vger.kernel.org\n");
 797         }
 798         if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_PATHNAME__BFS, &dummy)))
 799         {
 800                 printk(KERN_NOTICE PREFIX "BIOS offers _BFS\n");
 801                 printk(KERN_NOTICE PREFIX "If \"acpi.bfs=1\" improves resume, "
 802                         "please notify linux-acpi@vger.kernel.org\n");
 803         }
 804 }
 805
 806 int __init acpi_sleep_init(void)
 807 {
 808         acpi_status status;
 809         u8 type_a, type_b;
 810 #ifdef CONFIG_SUSPEND
 811         int i = 0;
 812
 813         dmi_check_system(acpisleep_dmi_table);
 814 #endif
 815
 816         if (acpi_disabled)
 817                 return 0;
 818
 819         sleep_states[ACPI_STATE_S0] = 1;
 820         printk(KERN_INFO PREFIX "(supports S0");
 821
 822 #ifdef CONFIG_SUSPEND
 823         for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) {
 824                 status = acpi_get_sleep_type_data(i, &type_a, &type_b);
 825                 if (ACPI_SUCCESS(status)) {
 826                         sleep_states[i] = 1;
 827                         printk(" S%d", i);
 828                 }
 829         }
 830
 831         suspend_set_ops(old_suspend_ordering ?
 832                 &acpi_suspend_ops_old : &acpi_suspend_ops);
 833 #endif
 834
 835 #ifdef CONFIG_HIBERNATION
 836         status = acpi_get_sleep_type_data(ACPI_STATE_S4, &type_a, &type_b);
 837         if (ACPI_SUCCESS(status)) {
 838                 hibernation_set_ops(old_suspend_ordering ?
 839                         &acpi_hibernation_ops_old : &acpi_hibernation_ops);
 840                 sleep_states[ACPI_STATE_S4] = 1;
 841                 printk(" S4");
 842                 if (!nosigcheck) {
 843                         acpi_get_table(ACPI_SIG_FACS, 1,
 844                                 (struct acpi_table_header **)&facs);
 845                         if (facs)
 846                                 s4_hardware_signature =
 847                                         facs->hardware_signature;
 848                 }
 849         }
 850 #endif
 851         status = acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b);
 852         if (ACPI_SUCCESS(status)) {
 853                 sleep_states[ACPI_STATE_S5] = 1;
 854                 printk(" S5");
 855                 pm_power_off_prepare = acpi_power_off_prepare;
 856                 pm_power_off = acpi_power_off;
 857         }
 858         printk(")\n");
 859         /*
 860          * Register the tts_notifier to reboot notifier list so that the _TTS
 861          * object can also be evaluated when the system enters S5.
 862          */
 863         register_reboot_notifier(&tts_notifier);
 864         acpi_gts_bfs_check();
 865         return 0;
 866 }